Collective backscattering of gyrotron radiation by small-scale plasma density fluctuations in large helical device

A version of the collective backscattering diagnostic using gyrotron radiation for small-scale turbulence is described. The diagnostic is used to measure small-scale (k(s) approximately 34 cm(-1)) plasma density fluctuations in large helical device experiments on the electron cyclotron heating of pl...

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Published inReview of scientific instruments Vol. 79; no. 10; p. 10E721
Main Authors Kharchev, Nikolay, Tanaka, Kenji, Kubo, Shin, Igami, Hiroe, Batanov, German, Petrov, Alexandr, Sarksyan, Karen, Skvortsova, Nina, Azuma, Yoshifumi, Tsuji-Iio, Shunji
Format Journal Article
LanguageEnglish
Published United States 01.10.2008
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Summary:A version of the collective backscattering diagnostic using gyrotron radiation for small-scale turbulence is described. The diagnostic is used to measure small-scale (k(s) approximately 34 cm(-1)) plasma density fluctuations in large helical device experiments on the electron cyclotron heating of plasma with the use of 200 kW 82.7 GHz heating gyrotron. A good signal to noise ratio during plasma production phase was obtained, while contamination of stray light increased during plasma build-up phase. The effect of the stray radiation was investigated. The available quasioptical system of the heating system was utilized for this purpose.
ISSN:1089-7623
DOI:10.1063/1.2982774